Rule attachment.



N0.718,3o. .'PA'TTNTETJJmpla,190s.

G. BAILEY. 1

RULE ATTACHMENT.

PPLIOATION FILED JULY 1902.

1ro MODEL.

M Noam vErsRS ca. PdrnLlTNO.. WASHINGTON, u. c..

UNITED STATES VPATENT OFFICE.

MAHLON G. BAILEY, OF SANJOSE, CALIFORNIA.

RULE ATTACHMENT.

SPECIFICATION forming part of Letters Patent No. 718,300, dated January 13, 1903.

t Application led July 8, 1.902. Serial No. 114,795. (No model.)

To @ZZ whom it may concern:v

Be it known that I, MAHLON G. BAILEY, a citizen of the United States, residing at San Jose, in the county of Santa Clara and State of California, have invented a new and useful Rule Attachment, of which the following is a specification. f

This invention relates to attachments to rules, more particularly to the ordinary carpenters rule, and has for its object the production of an attachment thereto whereby bevels or angles may be accurately measured and determined.

Another object of the invention is to produce the attachment in shape to be applied readily to a rule already constructed, as well as to rules when manufactured; and the invention consists in certain novel features of the construction, as hereinafter shown and described, and specified in the claims.

In the drawings illustrative of the invention, Figure 1 represents a portion of an ordinary carpenters rule with the improvement applied. Fig. 2 is a transverse section on the line II II of Fig. l. Fig. 3 is a perspective view of the improved attachmentdetached.

As before stated, the device is more particularly applicable to the ordinary carpenters rule, but may be applied to any form of similar implements or instruments. The two parts of the rule united by the rule-joint are represented at 10 11 with the usual graduations thereon, as shown.

The improvement which is the subject of the present application consists in a plate 12, circular in shape and attached to the rulejoint with its center coinciding exactly with the center of the joint-pivot. By this means the circular plate will retain the same position relatively with the parts 10 11 at all times and at all point-s of the movement of the latter. In rules ot' this character the members 10 11 are provided with bindingplates 13 14, extending some distance longitudinally thereof and forming apart of the rule-joint, the plate 13 extended in a circle, (indicated by dotted lines at 15 in'Fig.-1,)

while the plate 14 isformed with a curvedrecess in which the circle 15 fits, and in applying the plate 12 the latter is secured to the plate 13 and not to the plate 14, so that the member 11 is free to swing around beneath the plate 12 when the rule is opened at the central joint. The plate 12 may be attached in any suitable manner, preferably by a clip 16, formed integral with the plate and adapted to engage the outer end of the member 10, and it may be rigidly secured thereto in any preferred manner, but is preferably made detachable therefrom, so that different disks may be applied to the same rule interchangeably when it is desired to use the rule in different kinds of Work. By this means of attachmenttheimproved device may be readily applied-to anyordinary carpenters rule atany time required, which is a great convenience and adds materially to the value of the improvement, as it can be applied t0 the large number of rules already in use, and dependence need not, therefore, be necessarily placed upon manufacturers of rules for its introduction or application. At the same time the attachment may be applied to the rule when manufactured.

The disk 12 is provided with graduations representing the degrees of a circle, and any required number of the graduations may be employed, and for the purpose of illustration the graduations representing the angles most frequently employed are shown; but of course it will be understood that any number of graduations or graduations representing any desired angle may be employed,'and the graduations may be Varied for the use of different elasses of mechanics or artisans. For instance, for carpenters the graduations would be those vmostV employed by themsuch as the angles Vvfor roof-rafters, diagonal braces, cornice'miters, and the likewhile vfor masons or machinists other sets of graduations might be provided, as the improvement is capable of a wide range of application without departing from the principle of the invention or sacrificing any of its advantages, and any one of these disks may be intel'- changeably used on the same rule.

The disk 12 may be formed of a very thin sheet of metal, so as not to interfere in any manner with the ordinaryY uses of the rulev or render it cumbersome or. add materially to the expense and may be made of any desired size within the range of the width of the rule and the diameter of the portion v15 of the rulejoint.

-IOD

The plate l2 should be made as large as possible to reduce the chances for error in measurements, but should not exceed in diameter the combined Widths of the members 10-11, although, undercertain ci rcu instances, it might exceed in diameter the total width of the rule.

Having thus described my invention, what I claim isl. As a new article of manufacture, an attachment for rules consisting'of a disk having a clip extended from one side and adapted to enclasp one of the rule-sections with the center of the plate coinciding with the center of the rule-joint pivot, and provided with radial graduations, substantially as described. 

